Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » thien van, lieu va
hoc sac » hoc sach, hoc cac, hoc mac
duc van » duc va, duc tan, duc manh
nang xa » nang x, lang xa, nang ma
hanh va » hang va, hanh vi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
va cua » va chua, via cua, ca cua
cua te » cua tu
sac ky » cac ky, sai ky

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sac ky nang xa hoi. ((((hieu ve) OR (hieu va))) OR (hieu van)) cam duc van hanh va cua te~.
• Adding a wildcard symbol may retrieve word variants: hoc sac ky nang xa hoi. ((((hieu ve) or (hieu va))) or (hieu van)) cam duc van hanh va cua te*.